Spray nozzle



T. c. SELWAY SPRAY NOZZLE July 27, 1954 Filed April 17, 1952 I N VENTOR7"f/0N/75 C. 554 W);

7 w I z a v I a,

ATTORNEY Patented July 27, 1954 SPRAY NOZZLE Thomas C. Selway,

Baltimore, Md., assignor to The Glen L. Martin Company, Middle River,Md., a corporation of Maryland Application April 17, 1952, Serial No.282,757

2 Claims. 1

This invention relates to spray nozzles for applying paint or similarmaterials to surfaces, and more particularly to a nozzle for applying acoat of paint to inaccessible surfaces such as the interiors of pipesand tubes and the like.

Since a conventional paint spray nozzle gives a fan-shaped spraydirected in a generally forward direction, it is unsatisfactory forpainting the interiors of cylindrical objects of small diameter or thelateral interior walls of structures which are accessible only throughsmall access openings. To satisfactorily coat such surfaces it isnecessary to pI'OVide a spray nozzle which will give a uniformperipheral spray directed substantially normal to the axis of thenozzle. This type of nozzle is especially advantageous in the case ofpipes or tubes since one pass through the pipe with the nozzle mountedon a supply tube of suitable length is sufiicient to fully coat theentire inner surface of the pipe.

In the case of exceptionally long pipes, tubes, or similar cylindricalobjects, where th needed length of the supply tube to which the nozzleis aflixed would be impractical, the object to be painted may be placedin a vertical position and the nozzle lowered through the object at theend of a flexible supply hose.

In addition to providing a uniform uninterrupted radial spray, thenozzle contemplated provides for adjustment of the discharge opening, sothat the density of the spray may be regulated, and coating materials ofdifferent viscosities may be effectively applied by use of the samenozzle.

It is the object of this invention to provide a paint spray nozzle whichwill give a uniform radial spray directed substantially normal to thelongitudinal axis of the nozzle.

It is another object of this invention to provide such a spray nozzle inwhich the discharge opening is variable to adjust the density of thespray and to adapt the nozzle for use with coating substances of variousdensities and viscosities.

It is still another object of this invention to provide a spray nozzlethe construction of which is adapted for rapid and simple disassembly tofree the nozzle from clogging and for cleaning, and the dischargeopening of which is readily and easily adjusted.

These and further objects of this invention will become apparent fromthe following description taken in connection with the accompanyingdrawings.

In the drawing:

Fig. 1 is a view of the nozzle shown connected to a supply tube.

Fig. 2 is a sectional view of the nozzle showing its interiorarrangement.

As shown in the drawing the nozzle consists of an inner tubular memberI, an external sleeve member 2, and an inlet member 3.

Inner member I consists of a deflecting head 4, and a tubular stem 5 ofsomewhat smaller diameter extending rearwardly from. the head. A passage6 extends axially through the interior of the stem 5 and terminates atthe junction between the head 4 and the stem.

The rear portion of the stem 5 is threaded externally and carries thecylindrical sleeve 2 by means of mating internal threads 1 at the rearend of the sleeve.

Sleeve 2, which is preferably of the same outer diameter as deflectinghead 4, has an inner diameter somewhat larger than the stem 5 andextends coaxially therewith to form an annular chamber 8 surrounding thestem. The walls of the sleeve extend forward and terminate aft of therearward facing shoulder 9 of the head 4 so as to form an annulardischarge opening I 0 completely surrounding the nozzle. A series ofopenings I I in the wall of stem 5 serve to provide communicationbetween the passage 6 and the annular chamber 8.

The inlet member 3 is provided with internal threads I2 at its aft endto receive the adapter fitting I3, and is threaded internally at itsforward end so as to engage the exterior threads at the rearward end ofstem 5.

Inlet tube I4 is connected to adapter fitting I3 and serves to conductthe coating fluid from a pressurized source of supply (not shown) to thenozzle.

The coating fluid enters the nozzle through the inlet member 3 andpasses into the passage 6 from whence it travels through the openings IIinto the annular chamber 8 and radially outward through the dischargeopening I 0, being distributed in a peripheral spray, the density ofwhich is determined by the width of the discharge opening Ill.

Sleeve 2 is provided with a knurled surface I5 for convenient rotationso that the sleeve may be adjusted axially on stem 5, thus allowingadjustment of the width of discharge opening I0 to regulate the spray.Inlet member 3 is also provided with a knurled surface at I6 and acts asa lock nut to lock sleeve 2 in place on stem 5.

The arrangement above described provides a simple and readily adjustablespray nozzle which will deliver a completely circular spray of desireddensity in a plane substantially normal to the axis of the nozzle, thuseffectively coating the lateral interior walls of pipes, tubes, andstructures whose interiors are inaccessible to a conventional spray gun.Since the spray is delivered from the entire periphery of the nozzle, asimple axial motion of the nozzle through a tube will completely coatthe interior, no rotative motion of the nozzle being necessary.

Because of its simplicity of construction the nozzle may be easily andrapidly disassembled by hand for cleaning or removal of cloggingmaterials. Adjustment of the nozzle to vary the intensity of the sprayor to accommodate fluids of various densities is likewise easilyaccomplished by hand.

It is to be understood that the invention herein described is notconfined to the precise detailsof construction set forth, as it isapparent that many changes and variations may be made without departingfrom the scope of the invention, and no limitation is intended by thephraseology of the foregoing description of the illustrations in theaccompanying drawings.

I claim as my invention:

1. A spray nozzle comprising a cylindrical housing member, a sleevemember mounted within said housing member, said sleeve member having athreaded portion on the inner end thereof adapted to engagecorresponding threads on the inside of saidhousing member, the outer endof said sleeve being formed with a deflecting head having an outsidediameter substantially the same as the diameter of said housing member,the inner edge of said head cooperating with the end of said housingmember to form a peripheral slot, the axial width of said slot beingadjustable as said head and sleeve are moved relative to said housingmember, said sleeve member having a portion between said head and saidthreaded portion of smaller diameter than the inside of said housingmember forming an annular chamber with which said peripheral slotcommunicates, said smaller diameter 'portion of said sleeve havingapertures formed therein, a cylindrical looking member of substantiallythe same diameter as said housing member having internal threads toengage the threaded portion of said sleeve member, said locking memberadapted to abut the end of said housing member to maintain apredetermined adjustment on the axial width of said peripheral slot.

2. The device described in claim 1, wherein a hose connection is securedto said cylindrical locking member.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,070,872 Bond Aug. 19, 1913 1,098,884 Comstock June 2, 19141,779,691 Bennett Oct. 28, 1930 2,556,537 Harvey June 12, 1951

